Neuromuscular fatigue during a long-duration cycling exercise

Lepers, Romuald; Maffiuletti, Nicola A.; Rochette, Ludovic; Brugniaux, Julien V.; Millet, Guillaume Y.

doi:10.1152/japplphysiol.00880.2001

Cited by 202 publications

(270 citation statements)

References 26 publications

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“…2c). Over the 120 min simulated soccer match, central fatigue tended to be exacerbated, and this duration-dependent contribution of central processes to fatigue is broadly evident across a range of exercise modes (Lepers et al 2002;Place et al 2004;Thomas et al 2015). In this study, there was a pattern of a progressive decrease in voluntary activation across 120 min of the SMS (pre vs. HT; HT vs.…”

Section: Discussionmentioning

confidence: 59%

The assessment of neuromuscular fatigue during 120 min of simulated soccer exercise

et al. 2017

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ET, −18%, P ≤ 0.01), and voluntary activation measured with TMS (−11, −15 and −17%, respectively, P ≤ 0.01) were evident. The fatigue response was robust across both trials; the change in MVC at each time point demonstrated a good level of reliability (CV range 6-11%; ICC 2,1 0.83-0.94), whilst the responses identified with motor nerve stimulation showed a moderate level of reliability (CV range 5-18%; ICC 2,1 0.63-0.89) and the data obtained with motor cortex stimulation showed an excellent level of reliability (CV range 3-6%; ICC 2,1 0.90-0.98). Conclusion Simulated soccer exercise induces a significant level of fatigue, which is consistent on repeat tests, and involves both central and peripheral mechanisms. Keywords

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Section: Discussionmentioning

confidence: 59%

The assessment of neuromuscular fatigue during 120 min of simulated soccer exercise

et al. 2017

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“…Few studies, if any exist in the literature that use a central or general fatigue protocol to evaluate dynamic postural control especially in athletes with chronic ankle instability. Lepers et al (2002) used a cycling bout protocol, but did not examine dynamic postural control (Susco et al, 2004). Susco et al (2004) and Wilkins et al (2004) used this functional fatiguing protocol, but evaluated the subject's performance on the Balance Error Scoring System (BESS), a measure of static balance.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Fatigue and Chronic Ankle Instability on Dynamic Postural Control

Gribble

Hertel

Denegar

et al. 2010

Physics International

112

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Problem statement:The proprioception information is a prerequisite for balance, body's navigation system and the movement coordinator. The aim of this study was to investigate the effects of fatigue and chronic ankle instability on dynamic postural control. Approach: Thirty physical education students (14 males, 16 females) in two groups (15 healthy age = 21.78±0.79 years, height = 168.3±5.6 cm and weight = 63.6±2.6 kg, 15 with chronic ankle instability age = 21.43±0.83 years, height = 168.4±5.5 cm and weight = 63.3±3.2 kg) participated in this study voluntary. Star Excursion Balance Test was used for evaluation of dynamic postural control. Subjects performed a functional fatigued protocol that lasted 15 min. Using the Borg scale, also measured rating of perceived exertion before, middle and after the fatigue protocol. Results: The findings indicated that dynamic postural control decreased after fatigue in two groups (p<0.05). In contrast, there was only significance different between two groups after fatigue in lateral and antrolateral directions of Star Excursion Balance Test (p<0.05). Conclusion: Fatigue and chronic ankle instability can effect on dynamic postural control also, combination fatigue and chronic ankle instability can increase this effect. High incidence of ankle sprains especially in lateral and antrolateral directions which lead to reducing of balance can be practical guideline for training programs and management of fatigue in athletes. This finding also helps to sport physiotherapists to more emphasis on ankle sprain in rehabilitations on lateral and antrolateral directions.

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“…Low-frequency fatigue was present if there was a significant decrease in the Qtw response to the single twitch and the T2 response to the 10-Hz twitch immediately after exercise and if these decreases persisted with a gradual return toward control values by 70 min postexercise. The within-twitch responses to each single supramaximal 1-Hz stimulus (nonpotentiated and potentiated) and to each paired 100-Hz stimuli were analyzed for peak force (Qtw,peak), contraction time (CT), maximal rate of force development (MRFD), one-half relaxation time (RT0.5), and maximal relaxation rate (MRR) (31).…”

Section: Membrane Excitability and Contractile Functionmentioning

confidence: 99%

Effect of exercise-induced arterial hypoxemia on quadriceps muscle fatigue in healthy humans

Romer

Haverkamp²,

Lovering³

et al. 2006

American Journal of Physiology-Regulatory, Integrative and Comp

116

126

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-The effect of exercise-induced arterial hypoxemia (EIAH) on quadriceps muscle fatigue was assessed in 11 male endurance-trained subjects [peak O 2 uptake (V O2 peak) ϭ 56.4 Ϯ 2.8 ml⅐kg Ϫ1 ⅐min Ϫ1 ; mean Ϯ SE]. Subjects exercised on a cycle ergometer at Ն90% V O2 peak to exhaustion (13.2 Ϯ 0.8 min), during which time arterial O 2 saturation (SaO 2 ) fell from 97.7 Ϯ 0.1% at rest to 91.9 Ϯ 0.9% (range 84 -94%) at end exercise, primarily because of changes in blood pH (7.183 Ϯ 0.017) and body temperature (38.9 Ϯ 0.2°C). On a separate occasion, subjects repeated the exercise, for the same duration and at the same power output as before, but breathed gas mixtures [inspired O2 fraction (FIO 2 ) ϭ 0.25-0.31] that prevented EIAH (Sa O 2 ϭ 97-99%). Quadriceps muscle fatigue was assessed via supramaximal paired magnetic stimuli of the femoral nerve (1-100 Hz). Immediately after exercise at FI O 2 0.21, the mean force response across 1-100 Hz decreased 33 Ϯ 5% compared with only 15 Ϯ 5% when EIAH was prevented (P Ͻ 0.05). In a subgroup of four less fit subjects, who showed minimal EIAH at FIO 2 0.21 (SaO 2 ϭ 95.3 Ϯ 0.7%), the decrease in evoked force was exacerbated by 35% (P Ͻ 0.05) in response to further desaturation induced via FI O 2 0.17 (SaO 2 ϭ 87.8 Ϯ 0.5%) for the same duration and intensity of exercise. We conclude that the arterial O 2 desaturation that occurs in fit subjects during high-intensity exercise in normoxia (Ϫ6 Ϯ 1% ⌬Sa O 2 from rest) contributes significantly toward quadriceps muscle fatigue via a peripheral mechanism. magnetic stimulation; low-and high-frequency fatigue; quadriceps twitch force; voluntary activation; peripheral fatigue; central fatigue EXERCISE-INDUCED ARTERIAL HYPOXEMIA (EIAH), defined as a reduced arterial HbO 2 saturation below preexercise levels, occurs during sustained, heavy-intensity exercise to exhaustion in a significant number of healthy subjects (9). The desaturation is attributable primarily to a reduced arterial O 2 partial pressure (Pa O 2 ) in some highly fit subjects (17, 22, 52) or, more universally, to a rightward shift of the O 2 dissociation curve because of a time-and intensity-dependent metabolic acidosis and an increase in body temperature (42,50). EIAH has a detrimental effect on maximal O 2 uptake (V O 2 max ) (16, 41) and endurance exercise performance (36, 37).Multiple "peripheral" and "central" mechanisms have been proposed to explain how arterial hypoxemia limits endurance exercise performance. There is potential for reduced O 2 transport to cause limb muscle fatigue during heavy exercise via an effect of hypoxia on Ca 2ϩ uptake and Ca 2ϩ release by the sarcoplasmic reticulum (10). Changes in the intracellular environment may impair Ca 2ϩ cycling and other excitation/ contraction processes. Alternatively, an inability of the sarcolemma and T tubule to conduct repetitive action potentials may indirectly reduce Ca 2ϩ cycling. The possibility that such peripheral processes are involved in exercise limitation during hypoxemia is suggested by the finding that...

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Neuromuscular fatigue during a long-duration cycling exercise

Cited by 202 publications

References 26 publications

The assessment of neuromuscular fatigue during 120 min of simulated soccer exercise

The assessment of neuromuscular fatigue during 120 min of simulated soccer exercise

The Effects of Fatigue and Chronic Ankle Instability on Dynamic Postural Control

Effect of exercise-induced arterial hypoxemia on quadriceps muscle fatigue in healthy humans

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